{"id":57599,"date":"2025-07-31T15:57:38","date_gmt":"2025-07-31T10:27:38","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=57599"},"modified":"2025-07-31T15:57:38","modified_gmt":"2025-07-31T10:27:38","slug":"nisar-satellite","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/nisar-satellite\/","title":{"rendered":"Nisar Satellite, Objectives, Spacecraft Configuration, Mission Phase"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">Nisar Satellite is an Earth observation satellite jointly developed by ISRO and NASA, built on ISRO\u2019s I-3K satellite platform, it uses both L-band and S-band Synthetic Aperture Radar (SAR) systems, which allow it to see through clouds, smoke, and even vegetation, day or night, regardless of weather.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The L-band radar works like an X-ray, it can peer beneath forest canopies, track glacier movement, and detect subtle shifts in the Earth\u2019s crust, which helps with things like earthquake forecasting. On the other hand, the S-band radar focuses on surface-level details. It\u2019s great for monitoring crops, spotting snow cover changes, and measuring soil moisture.<\/span><\/p>\n<h2><b>Nisar Satellite Objectives<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The Nisar Satellite not only clicks pictures from orbit, it\u2019s about decoding Earth\u2019s ongoing transformations. With its dual-band radar system, NISAR will give scientists the tools to monitor key environmental and geological changes over time. Key Objectives of the Nisar Satellite:<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Track land surface deformation caused by earthquakes, volcanic activity, and landslides.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Monitor glaciers and polar ice sheets to study melting patterns and sea-level rise.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Map subsidence and uplift due to groundwater depletion, mining, and hydrocarbon extraction.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Measure forest biomass and detect changes in forest cover to support carbon accounting.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Detect crop extent and changes to aid agricultural planning and food security.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Observe the dynamics of wetlands to understand their ecological health and seasonal shifts.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Study sea ice and selected ocean areas to monitor shifts in polar climates.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Enable regular, high-resolution mapping of Earth&#8217;s land and ice-covered surfaces every 12 days.<\/span><\/li>\n<\/ul>\n<h2><b>Nisar Satellite Spacecraft Configuration<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The <a href=\"https:\/\/vajiramandravi.com\/current-affairs\/nisar-satellite-a-landmark-nasa-isro-collaboration\/\" target=\"_blank\"><strong>Nisar Satellite<\/strong><\/a> is built on ISRO\u2019s I-3K satellite bus and carries two core payloads: the L-band and S-band Synthetic Aperture Radars (SAR). These two radar systems work together to collect rich, high-resolution data on Earth\u2019s surface and subsurface changes.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The mission is a true collaboration between ISRO and NASA, where both agencies bring their strengths, ISRO handles much of the spacecraft design and support, while NASA contributes key payload elements and mission planning.<\/span><\/p>\n<table>\n<tbody>\n<tr>\n<td class=\"tb-color\" style=\"text-align: center;\" colspan=\"2\"><b>Nisar Satellite Spacecraft Configuration<\/b><\/td>\n<\/tr>\n<tr>\n<td>\n<p><span style=\"font-weight: 400;\">Mainframe Bus<\/span><\/p>\n<\/td>\n<td>\n<p><span style=\"font-weight: 400;\">I3K Structure with ~2400Kg Lift Off Mass<\/span><\/p>\n<p><span style=\"font-weight: 400;\">70V Bus<\/span><\/p>\n<p><span style=\"font-weight: 400;\">3-axis stabilized spacecraft<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><span style=\"font-weight: 400;\">Imaging Payload<\/span><\/p>\n<\/td>\n<td>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Dual Frequency (L &amp; S-Band) Synthetic Aperture Radar (SAR).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">L-band SAR (NASA); S-band SAR (SAC-ISRO)<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Large size 12m diameter common unfurlable reflector antenna mounted on deployable 9m Boom.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">~240 km observable swath with 5-100 m resolution<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">Free and open data policy<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><span style=\"font-weight: 400;\">Orbit<\/span><\/p>\n<\/td>\n<td>\n<p><span style=\"font-weight: 400;\">Sun synchronous, Polar (6PM)<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><span style=\"font-weight: 400;\">Orbit altitude<\/span><\/p>\n<\/td>\n<td>\n<p><span style=\"font-weight: 400;\">747 km \u2013 Circular<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><span style=\"font-weight: 400;\">Inclination<\/span><\/p>\n<\/td>\n<td>\n<p><span style=\"font-weight: 400;\">98.405 deg<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><span style=\"font-weight: 400;\">Launcher<\/span><\/p>\n<\/td>\n<td>\n<p><span style=\"font-weight: 400;\">GSLV Mk-II with 4m PLF<\/span><\/p>\n<\/td>\n<\/tr>\n<tr>\n<td>\n<p><span style=\"font-weight: 400;\">Mission Life<\/span><\/p>\n<\/td>\n<td>\n<p><span style=\"font-weight: 400;\">5 Years<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><b>ISRO Responsibilities in Nisar Satellite<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Designed and built the spacecraft platform (I-3K structure).<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Developed the S-band radar system, used for imaging surface-level changes.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Built the data handling system and high-speed downlink system for transmitting radar data to ground stations.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Responsible for the launch vehicle and launch operations from Indian soil.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Manages satellite commanding and control once NISAR is in orbit.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Provides ground station support for receiving radar data and image downloads.<\/span><\/li>\n<\/ul>\n<p><em>Also Check: <a href=\"https:\/\/vajiramandravi.com\/current-affairs\/geosynchronous-satellite-launch-vehicle-gslv\/\" target=\"_blank\"><strong>Geosynchronous Satellite<\/strong><\/a><\/em><\/p>\n<h2><b>NASA Responsibilities in Nisar Satellite<\/b><\/h2>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Developed the L-band radar system, which can penetrate vegetation and soil for subsurface imaging.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Supplied the 9-meter deployable boom that supports the large 12-meter radar reflector.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Delivered the Solid-State Recorder, GPS receiver, and part of the high-speed downlink system.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Provides the orbital maneuver plan and oversees the radar operations strategy.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Supports the mission with its ground stations, working in sync with ISRO\u2019s network.<\/span><\/li>\n<\/ul>\n<h2><b>Nisar Satellite Mission Phase<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The Nisar Satellite Mission Phase is structured into four key phases, each critical for the satellite\u2019s success in gathering and transmitting Earth observation data:<\/span><\/p>\n<h3><b>Launch Phase<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Nisar Satellite is scheduled to launch on July 30, 2025, aboard the GSLV-F16 from ISRO\u2019s Satish Dhawan Space Centre (SHAR) in Sriharikota. This marks the beginning of its journey into low-Earth orbit.<\/span><\/p>\n<h3><b>Deployment Phase<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">Once in orbit, a 12-meter diameter radar reflector will be deployed using a 9-meter boom developed by NASA\u2019s Jet Propulsion Laboratory. This stage involves complex mechanical operations to ensure the radar system is correctly extended and aligned.<\/span><\/p>\n<h3><b>Commissioning Phase<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">The first 90 days post-launch focus on in-orbit testing and calibration. This includes verifying satellite subsystems, checking radar payloads, and ensuring that instruments are functioning as expected. Initial operations are led jointly by ISRO and JPL.<\/span><\/p>\n<h3><b>Science Operations Phase<\/b><\/h3>\n<p><span style=\"font-weight: 400;\">This long-duration phase starts once commissioning ends. The satellite begins systematic Earth observations, including radar imaging, data collection, calibration, and orbit maintenance. Regular coordination between ISRO and NASA ensures smooth operations and data delivery throughout its mission life.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>NISAR Satellite is a joint NASA-ISRO mission focused on Earth observation. Learn about its objectives, spacecraft design, key mission phases, and its significance for climate and disaster studies.<\/p>\n","protected":false},"author":25,"featured_media":57592,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[786],"tags":[1835],"class_list":{"0":"post-57599","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-general-studies","8":"tag-nisar-satellite","9":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/57599","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/25"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=57599"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/57599\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/57592"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=57599"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=57599"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=57599"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}